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Hot Water Issue

We have recently installed a outside hot water boiler.  We brought the lines in and have three zones off of them.  The bottom zone goes around the main floor the top zone is to the upstairs.  We have the old cast iron radiators in the upstairs and baseboard in the down stairs.  Down stairs works perfectly fine all the time.  The second floor is where the problem occurs.  We can get them to fill up when the cirrculator is running and then when the thermostat kicks the cirrucrulator off the water back drains out of the radiators.  We piped them so the each room can be turned down at the radiator.  The way we did this was to run a main line in the ceiling of the first floor and we T'd off to the in and out on each radiator.  The in and out are both on the bottom of the radiators.  Any ideas on how to fix the water leaving the radiators and going back through the cirrculator and out to the stove would be greatly appraited.


  • Ironman
    Ironman Member Posts: 7,224
    More Info Needed

    Is the wood boiler pressurized?

    If not, did you isolate the house loop from the boiler with a heat exchanger? Is the house loop pressurized?

    Can you post a diagram or pics of the system?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • kcopp
    kcopp Member Posts: 4,305
    I bet that....

    the outdoor boiler is not a pressure vessel... They need a heat exchanger to make the inside pressurized.... and all the fixings to go w/ it. (extrol tank. separate fill. separate circulator.....)
  • NRT_Rob
    NRT_Rob Member Posts: 1,013
    and that

    is exactly what we would recommend.

    multiple story unpressurized systems are no fun.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
This discussion has been closed.